Dresden 2020 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 49: Topolectric Circuits and Quantum Hall Systems
TT 49.1: Talk
Wednesday, March 18, 2020, 17:15–17:30, HSZ 103
Re-entrant Topological Defect Mode in a PT-Symmetric Circuit — •Alexander Stegmaier1, Tobias Helbig1, Tobias Hofmann1, Stefan Imhof1, Lee Ching Hua2, and Ronny Thomale1 — 1Institute of Theoretical Physics I, University of Würzburg, Germany — 2National University of Singapore, Singapore
Systems obeying PT-symmetry are a special case in non-Hermitian physics where real eigenvalue spectra can still emerge. They usually exhibit a phase diagram with different regimes of symmetry conservation or spontaneous symmetry breaking in their eigenstates. We examine a localized zero-energy defect mode within a PT-symmetric SSH chain that disappears and re-emerges at different PT phase transitions and present an exhaustive explanation for this phenomenon. Our theoretical findings are confirmed by eigenstate measurements for different gain/loss profiles in an electrical circuit implementation.